<p><strong>The sharpest look yet at the oldest known dinosaur embryos (pictured, one of the eggs and its inhabitant) has revealed some "big surprises," a scientist says.<br></strong></p><p>For one thing, the 190-million-year-old babies of <em>Massospondylus</em>—a two-legged dinosaur that preceded the well-known sauropods, such as<em> Diplodocus—</em>do not resemble their parents, according to study co-author <a id="agdw" title="Hans Dieter-Sues" href="http://paleobiology.si.edu/staff/individuals/sues.html">Hans-Dieter Sues</a>, a paleontologist at the National Museum of Natural History in Washington, D.C. (<a id="dinh" title="See more dinosaur embryo pictures." href="http://news.nationalgeographic.com/news/2005/07/photogalleries/dinoembryo/index.html">See more dinosaur-embryo pictures.</a>)</p><p>The 8-inch-long (20-centimeter-long) youngster, for example, had long front legs for walking on all fours, and its overall body proportion—such as a short snout—made it "look like a dwarf version of a sauropod dinosaur," the largest animals to walk Earth. (<a href="http://news.nationalgeographic.com/news/bigphotos/87644582.html">See a sauropod picture.</a>) The babies would have lost these traits as they matured.</p><p>The discovery suggests <em>Massospondylus</em> had characteristics that "foreshadowed" the later look of the sauropods, he said. (See <a id="ln:." title="&quot;New Strong-Handed Dinosaur May Shatter Assumptions.&quot;" href="http://news.nationalgeographic.com/news/2010/10/101006-new-dinosaur-north-america-science/">"New Strong-Handed Dinosaur May Shatter Assumptions."</a>)</p><p><em>—Christine Dell'Amore</em></p><p><em>The oldest-dinosaur-embryo research appears in the November issue of the </em><a id="p25l" title="Journal of Vertebrate Paleontology." href="http://www.vertpaleo.org/publications/index.cfm">Journal of Vertebrate Paleontology.</a></p>

Oldest Embryo

The sharpest look yet at the oldest known dinosaur embryos (pictured, one of the eggs and its inhabitant) has revealed some "big surprises," a scientist says.

For one thing, the 190-million-year-old babies of Massospondylus—a two-legged dinosaur that preceded the well-known sauropods, such as Diplodocus—do not resemble their parents, according to study co-author Hans-Dieter Sues, a paleontologist at the National Museum of Natural History in Washington, D.C. (See more dinosaur-embryo pictures.)

The 8-inch-long (20-centimeter-long) youngster, for example, had long front legs for walking on all fours, and its overall body proportion—such as a short snout—made it "look like a dwarf version of a sauropod dinosaur," the largest animals to walk Earth. (See a sauropod picture.) The babies would have lost these traits as they matured.

The discovery suggests Massospondylus had characteristics that "foreshadowed" the later look of the sauropods, he said. (See "New Strong-Handed Dinosaur May Shatter Assumptions.")

—Christine Dell'Amore

The oldest-dinosaur-embryo research appears in the November issue of the Journal of Vertebrate Paleontology.

Photograph courtesy Diane Scott, University of Toronto

Pictures: Oldest Dinosaur Embryos Show "Big Surprises"

The most detailed look yet at the 190-million-year-old babies reveal a lack of teeth, suggesting their parents may have cared for them, a new study says.

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